Establish a metal hydride reactor and test platform, and obtain the corresponding internal temperature and hydrogen absorption/desorption flow data of the reactor under different water bath temperatures, hydrogen release flow rates, and reactor structures (square, honeycomb, and no barriers) through experimental tests to determine The temperature field distribution trends and rules of different reactor internal structures are analyzed. The results show that the square structure reactor has the fastest internal temperature change rate and the best heat exchange effect. The comprehensive performance of the square structure reactor under different hydrogen absorption pressures and hydrogen release flow rates was further studied. The results show that when the inlet pressure is 2.0 MPa to 3.0 MPa, the hydrogen absorption amount and hydrogen absorption rate of the alloy material can be significantly increased; when the hydrogen release flow rate is less than 3.2 L/min, more than 85% of hydrogen can be released. The research results can provide technical guidance for modular and systematic design.

Oil and gas pipelines (X52 steel) in the marine environment are highly susceptible to corrosion. The effects of different dissolved oxygen concentration, pH, and hydrostatic pressure on the corrosion behavior of X52 pipeline steel in the marine environment was analyzed using electrochemical testing technology and observation of corrosion morphology. The results show that the corrosion of the pipeline slowed down as the ambient pH increased, while the corrosion of the pipeline steel increased as the dissolved oxygen content and hydrostatic pressure increased. The corrosion behavior of pipeline steel under different conditions is controlled by anodic activation of dissolution, and all appear local pitting corrosion phenomenon.

The residual magnetic stress detection technology can effectively detect the stress concentration of ferromagnetic materials, and has great potential in the field of long?distance oil and gas pipeline stress detection. However, due to the imperfect mechanism of the residual magnetic stress detection technology, the relationship between the residual magnetic signal and the stress is difficult to calculate quantitatively, resulting in the quantitative measurement of the residual magnetic stress detection, which seriously affects the application of the technology in the field of pipeline detection. In this paper, the mechanism of remanence generation is explained based on the magnetic domain model. Correspondence between remanence and stress is established by coercive force. The changing characteristics of remanence signal with the change of stress are analyzed and verified by experiments. The research results show that the irreversible magnetization of ferromagnetic materials is the cause of residual magnetism; as the external stress increases, the residual magnetism signal has a gradually increasing change rule.